修复新增单据报错问题

flow-workflow/flow-workflow-biz/src/main/java/com/flow/listener/GlobalActivityEventListener.java

@@ -182,7 +182,7 @@ public class GlobalActivityEventListener extends AbstractFlowableEngineEventList
                 //
                 if (isFirstNode || isLastNode) {
                     // 第一个节点或最后一个节点，消息发送人为当前登录用户
-                    notify.setSender(SecurityContextUtil.getUserId());
+                    notify.setSender(Objects.requireNonNull(SecurityContextUtil.getUserInfo()).getUsername());
                 } else {
                     // 其余节点，消息发送人为发起人
                     notify.setSender(userByUserId.getUsername());